Heating System Piping - RBI SPECTRUM Series Installation & Operation Manual

Relief Valve
Pipe the discharge of the pressure relief valve to prevent
scalding in the event of a discharge, see Figure 4. The
discharge piping must be sized the same as the
pressure relief valve outlet and installed to allow
complete drainage of both the relief valve and the
discharge piping.
Figure 4
1", 25 mm
WARNING: Never install any type of valve
between the boiler/water heater and the relief
valve or an explosion causing extensive property
damage, severe personal injury or death may
occur!
Flow Switch
The fl ow switch supplied with the boiler/water heater must
be wired to the terminal strip in the control panel to
prevent the boiler from fi ring unless there's adequate
water fl ow through the unit. The fl ow switch must be
installed in the supply piping adjacent to the boiler outlet
connection.
CAUTION: Failure to properly install the fl ow switch
may result in damage to the boiler/water heater heat
exchanger voiding the warranty!

HEATING SYSTEM PIPING

General Piping Requirements
All heating system piping must be installed by a qualifi ed
technician in accordance with the latest revision of the
ANSI/ASME Boiler and Pressure Vessel Code, Section
IV, and ANSI/ASME CSD-1, Standard for Controls and
Safety Devices for Automatically Fired Boilers. All
applicable local codes and ordinances must also be
followed. A minimum clearance of 1 in, 25 mm must be
maintained between heating system pipes and all
combustible construction. All heating system piping must
be supported by suitable hangers not the boiler.
SPECTRUM INSTALLATION AND OPERATING INSTRUCTIONS
The thermal expansion of the system must be
considered when supporting the system. A minimum
system pressure of 12 psig, 82.7 kPa must be
maintained.
Heating Boiler Piping Connections
The supply and return connections should be sized to
suit the system, see Table 6.
Table 6 - Supply & Return Pipe Sizing
Model Size
100 thru 400
Pump Requirements
This low mass boiler requires a continuous minimum
water fl ow for proper operation. The boiler pump must
be sized to overcome the head loss of the boiler and the
near piping in order to achieve the required temperature
rise. Table 7 and 8 provides the heat exchanger pressure
drop and temperature rise fi gures.
The temperature rise across the boiler must never
exceed 30°F, 16.7 °C. A pump delay is installed, the
RIOM-57
pump delay turns the pump on each time the burners
fi re and runs the pump up to 10 minutes after the call
for heat is satisfi ed.
CAUTION: A temperature rise outside of the range
listed in Tables 7 or 8 indicates that the fl ow rate
through the heat exchanger is incorrect which will
damage the heat exchanger voiding the warranty!
The maximum allowable flow rate through a
Spectrum boiler with copper heat exchanger is 92
GPM, 5.8 L/s (2-pass heat exchanger) and 46 GPM,
2.9 L/s (4-pass heat exchanger).
Low Water Cutoff
If a boiler is installed above any radiation elements it
must be fi tted with a low water cutoff device.
Refer to wiring diagram supplied with the boiler/water
heater for proper wiring connections.
Expansion Tank
An expansion tank or other means to control thermal
expansion must be installed in the heating system. An
expansion tank must be installed close to the boiler on
the suction side of the system pump.
Primary/Secondary Piping
Boilers connected to heating systems using zone valves,
zone pumps, or systems that have excessive fl ow rates
or return water temperatures less than 110°F, 43 °C
must be isolated from these systems to protect the
boiler.
Supply Return
1 1 / " NPT 1 1 / " NPT
2 2
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